Chavez Vows to Fight Oil Strike****He urged thousands of followers not to be provoked into violence by the opposition and to be alert to conspiracies against his 3-year-old government…..Bands of Chavez supporters known as "Bolivarian Circles" clashed with strikers outside PDVSA headquarters, and at least 18 people were injured, many of them Chavez supporters, police officers at the scene said.****